It is obtain by summation in \(\ell \)  following the same line of reasoning that lead to Theorem REF  above. The most significant complication is due to
the asymmetry of the Regge-Wheeler potential: while the inverse square potential for \(x\rightarrow \infty \)  is covered by [1]} as before, the exponentially decaying part
on the left requires another WKB analysis. We refer the reader to [2]} for the details.
